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This article mainly explains "what are the functions of Ceilometer". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what are the functions of Ceilometer"?

The telemetry data collection service provides the following functions:

Efficiently poll and measure data related to OpenStack services

Collect events and measurement data by monitoring notifications from the service

Publish collected data to various targets, including data stores and message queues

The telemetry service consists of the following components:

Computing Agent (ceilometer-agent-compute)

Runs on each compute node and polls resource utilization statistics. This is actually ceilometer-polling running on the compute node using the-- polling-namespace compute parameter.

Central Agent (ceilometer-agent-central)

Runs on a central management server to poll resource utilization statistics instead of binding to the resource of the instance or compute node. Multiple agents can be started to scale out the service. This is actually using the-polling-namespace central parameter on the compute node to run the ceilometer-polling service.

Notification Agent (ceilometer-agent-notification)

The service is run on a central management server and messages from message queues are consumed to build events and measurement data. The data is then published to the defined target. By default, data is pushed to Gnocchi.

These services communicate by using the OpenStack message bus. Ceilometer data is designed to be used for each endpoint of storage and analysis.

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